Adjustable reactance transformer



'2 Sheets-Sheet 1 Al Ian Bher'wdPicKsJ'r;

7v His A torney.

A I Inventor:

July 30, 1935. A. B. HENDRICKS, JR

' ADJUSTABLE REACTANCE TRANSFORMER Filed Nov. 1, 1934 July 30, 1935. A. B. HENDRICKS, JR

I ADJUSTABLE REACTANCE TRANSFORMER Filed Nov. 1, 1934 2 Sheets-Sheet 2 Inventon:

AI Ian B. Hendricks Jn, 'by H isAttonney.

lllllllllllllIllmlllllllll lIIllllllllllllllfiilllllllll Patented July 30, 1935 ADJUSTABLE REACTANCE TRANSFOBIKER Allan B. Hendricks, Jr., Pltts field, Mass., asslgnor to General Electric Company, a. corporation of New York Application November 1, 1934, Serial No. 750,933 3laims. (Cl. iii-11s) My invention relates to adjustable reactance transformers of the type having a movable winding. It is often desirable that some arrangement be provided for adjusting the reactance of a transformer to control the secondary current, as for example where the transformer supplies current for welding operation. The general object of the invention is to provide an. improved-adiustable reactance transformer with convenient and compact means for moving one of its windlugs and holding it in any desired position.

The invention will be better understood from the following description taken in connection with the accompanying drawings in which Fig. l

is a longitudinal sectional view of a transformer constructed in accordance with the invention, this figure being taken on line ll oi Fig. 5; Figs. 2 and 3 are enlarged perspective views of a support for the movable winding of the transformer; Fig. 4 is an end view of the transformer with the operating handle removed; and Fig. 5 is a sectional view on the line 55 of Fig. 1.

Like reference characters indicate similar parts in the different figures of the drawings.

The transformer shown in the drawings includes a magnetic core l having a winding leg II. The core I!) is formed of four rectangular sections l2. The winding leg ll includes one side of each of the core sections I2 fitted together to leave a central longitudinal space 13, the other sides of the coresections 12 providing return paths for the magnetic core flux. The four core sections l2 are secured together by end clamps II and I and rods or bolts IS. The winding leg I l is surrounded by windings l1 and N3, the windings being separated from the winding leg by an insulating cylinder I9. The winding 11 is secured in position at one end of the winding leg H but the winding [8 is free to move along the winding leg and thus to change its position with respect to the winding H.

A threaded rod orscrew 20, which extends into the space l3 in the winding leg of the core, is supported at its outer end by a ball-bearing 2| so that this screw 20 is free to rotate but cannot move longitudinally. The inner end of the screw 20 is threaded into an internally threaded nut 22 which fits loosely in the space iii. The space I8 is square in cross section and the nut 22 is also square so that the nut, while free to move lengthwise of the space, cannot turn in it. Four wings or brackets 23 secured to the nut 22 extend out-' wardly through slots 24in the inner sides of the core sections l2.' These core sections l2 are formed of thin, magnetic laminations and the slots 23 are-- formed by inserting non-magnetic spacing. strips 25 at suitable places in the core sections. The insulating cylinder 43 is also provided with slots 26 in alignment with the slots 245 of the core sections i2. The outer ends of the brackets 23 extend through these slots 25 in the insulating cylinder and are secured to a ring 21 which supports the movable winding l8. The nut 22 is formed with shoulders 23 which engage opposite edges of the inner ends of the brackets 23 and the brackets are secured to the nut be tween these shoulders by small projections 29 integral with the nut and headed over in openings 30 in the inner ends of the brackets.

The screw 28 may be rotated by a handle 3| secured to its outer end. The nut 22, brackets 23 and ring 2'! form a support for the movable winding i8 and this support with the movable winding may be easily moved toward or away from the fixed winding ill by rotating the screw 20 in any proper direction, thus adjusting the reactance of the transformer as desired. As the movable winding i8 is moved away from the fixed winding 11 the reactance of the transformer is of course increased and as it is moved toward the fixed winding ll the reactance is decreased.

It is obvious that the transformer may be used in any desirable position and that it is immaterial which winding is the primary winding and which is the secondary winding.

The invention has been explained by describing ahd illustrating a particular form thereof but it will be obvious that changes may be made without departing from the spirit of the invention and the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent of the United States, is,- 4

1. A transformer including a magnetic core having a winding leg with a longitudinal space therein, two windings surroundingthe winding leg, one of said windings being movable along the winding leg, a support for the movable winding, and means within said space and engaging said support for adjusting the position of the movable winding along the winding leg.

2. A transformer including a magnetic core having a winding leg with a longitudinal space therein, two windings surrounding the winding leg, one of said windings being movable along the winding leg, said winding leg having slots between said space and the movable winding, 2. support extending through said slots and secured to the movable winding, and means within said space and engaging said support for adjusting the position of the movable winding along the winding leg.

3. A transformer including a magnetic core having a winding leg with a longitudinal space 5 therein, two windings surrounding the winding leg, one of said windings being movable along the winding leg, said winding leg having slots between said space and the movable winding, a threaded member in said space, brackets extending through said slots and secured to said member and to the movable winding, and a screw engaging said member for adjusting the position of the movable winding along the winding leg.

- ALLAN B. HENDRICKS, JR. 

